/*******************************************************************************
 * Copyright (c) 2000, 2013 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.core.search.indexing;

import org.eclipse.core.filesystem.EFS;
import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IResourceProxy;
import org.eclipse.core.resources.IResourceProxyVisitor;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.jdt.core.IClasspathEntry;
import org.eclipse.jdt.core.JavaCore;
import org.eclipse.jdt.internal.compiler.SourceElementParser;
import org.eclipse.jdt.internal.compiler.util.SimpleLookupTable;
import org.eclipse.jdt.internal.core.ClasspathEntry;
import org.eclipse.jdt.internal.core.JavaProject;
import org.eclipse.jdt.internal.core.index.Index;
import org.eclipse.jdt.internal.core.search.processing.JobManager;
import org.eclipse.jdt.internal.core.util.Util;

import java.io.IOException;
import java.net.URI;
import java.util.HashSet;

@SuppressWarnings({"rawtypes", "unchecked"})
public class IndexAllProject extends IndexRequest {
    IProject project;

    public IndexAllProject(IProject project, IndexManager manager) {
        super(project.getFullPath(), manager);
        this.project = project;
    }

    public boolean equals(Object o) {
        if (o instanceof IndexAllProject)
            return this.project.equals(((IndexAllProject)o).project);
        return false;
    }

    /**
     * Ensure consistency of a project index. Need to walk all nested resources,
     * and discover resources which have either been changed, added or deleted
     * since the index was produced.
     */
    public boolean execute(IProgressMonitor progressMonitor) {

        if (this.isCancelled || progressMonitor != null && progressMonitor.isCanceled()) return true;
        if (!this.project.isAccessible()) return true; // nothing to do

        ReadWriteMonitor monitor = null;
        try {
            // Get source folder entries. Libraries are done as a separate job
            JavaProject javaProject = (JavaProject)JavaCore.create(this.project);
            // Do not create marker while getting raw classpath (see bug 41859)
            IClasspathEntry[] entries = javaProject.getRawClasspath();
            int length = entries.length;
            IClasspathEntry[] sourceEntries = new IClasspathEntry[length];
            int sourceEntriesNumber = 0;
            for (int i = 0; i < length; i++) {
                IClasspathEntry entry = entries[i];
                if (entry.getEntryKind() == IClasspathEntry.CPE_SOURCE)
                    sourceEntries[sourceEntriesNumber++] = entry;
            }
            if (sourceEntriesNumber == 0) {
                IPath projectPath = javaProject.getPath();
                for (int i = 0; i < length; i++) {
                    IClasspathEntry entry = entries[i];
                    if (entry.getEntryKind() == IClasspathEntry.CPE_LIBRARY && entry.getPath().equals(projectPath)) {
                        // the project is also a library folder (see https://bugs.eclipse.org/bugs/show_bug.cgi?id=89815)
                        // ensure a job exists to index it as a binary folder
                        this.manager.indexLibrary(projectPath, this.project, ((ClasspathEntry)entry).getLibraryIndexLocation());
                        return true;
                    }
                }

                // nothing to index but want to save an empty index file so its not 'rebuilt' when part of a search request
                Index index = this.manager.getIndexForUpdate(this.containerPath, true, /*reuse index file*/ true /*create if none*/);
                if (index != null)
                    this.manager.saveIndex(index);
                return true;
            }
            if (sourceEntriesNumber != length)
                System.arraycopy(sourceEntries, 0, sourceEntries = new IClasspathEntry[sourceEntriesNumber], 0, sourceEntriesNumber);

            Index index = this.manager.getIndexForUpdate(this.containerPath, true, /*reuse index file*/ true /*create if none*/);
            if (index == null) return true;
            monitor = index.monitor;
            if (monitor == null) return true; // index got deleted since acquired

            monitor.enterRead(); // ask permission to read

            String[] paths = index.queryDocumentNames(""); // all file names //$NON-NLS-1$
            int max = paths == null ? 0 : paths.length;
            final SimpleLookupTable indexedFileNames = new SimpleLookupTable(max == 0 ? 33 : max + 11);
            final String OK = "OK"; //$NON-NLS-1$
            final String DELETED = "DELETED"; //$NON-NLS-1$
            if (paths != null) {
                for (int i = 0; i < max; i++)
                    indexedFileNames.put(paths[i], DELETED);
            }
            final long indexLastModified = max == 0 ? 0L : index.getIndexLastModified();

            IWorkspaceRoot root = this.project.getWorkspace().getRoot();
            for (int i = 0; i < sourceEntriesNumber; i++) {
                if (this.isCancelled) return false;

                IClasspathEntry entry = sourceEntries[i];
                IResource sourceFolder = root.findMember(entry.getPath());
                if (sourceFolder != null) {

                    // collect output locations if source is project (see http://bugs.eclipse.org/bugs/show_bug.cgi?id=32041)
                    final HashSet outputs = new HashSet();
                    if (sourceFolder.getType() == IResource.PROJECT) {
                        // Do not create marker while getting output location (see bug 41859)
                        outputs.add(javaProject.getOutputLocation());
                        for (int j = 0; j < sourceEntriesNumber; j++) {
                            IPath output = sourceEntries[j].getOutputLocation();
                            if (output != null) {
                                outputs.add(output);
                            }
                        }
                    }
                    final boolean hasOutputs = !outputs.isEmpty();

                    final char[][] inclusionPatterns = ((ClasspathEntry)entry).fullInclusionPatternChars();
                    final char[][] exclusionPatterns = ((ClasspathEntry)entry).fullExclusionPatternChars();
                    if (max == 0) {
                        sourceFolder.accept(
                                new IResourceProxyVisitor() {
                                    public boolean visit(IResourceProxy proxy) {
                                        if (IndexAllProject.this.isCancelled) return false;
                                        switch (proxy.getType()) {
                                            case IResource.FILE:
                                                if (org.eclipse.jdt.internal.core.util.Util.isJavaLikeFileName(proxy.getName())) {
                                                    IFile file = (IFile)proxy.requestResource();
                                                    if (exclusionPatterns != null || inclusionPatterns != null)
                                                        if (Util.isExcluded(file, inclusionPatterns, exclusionPatterns))
                                                            return false;
                                                    indexedFileNames
                                                            .put(Util.relativePath(file.getFullPath(), project.getFullPath().segmentCount()/*remove project segment*/),
                                                                 file);
                                                }
                                                return false;
                                            case IResource.FOLDER:
                                                if (exclusionPatterns != null && inclusionPatterns == null) {
                                                    // if there are inclusion patterns then we must walk the children
                                                    if (Util.isExcluded(proxy.requestFullPath(), inclusionPatterns, exclusionPatterns,
                                                                        true))
                                                        return false;
                                                }
                                                if (hasOutputs && outputs.contains(proxy.requestFullPath()))
                                                    return false;
                                        }
                                        return true;
                                    }
                                },
                                IResource.NONE
                                           );
                    } else {
                        sourceFolder.accept(
                                new IResourceProxyVisitor() {
                                    public boolean visit(IResourceProxy proxy) throws CoreException {
                                        if (IndexAllProject.this.isCancelled) return false;
                                        switch (proxy.getType()) {
                                            case IResource.FILE:
                                                if (org.eclipse.jdt.internal.core.util.Util.isJavaLikeFileName(proxy.getName())) {
                                                    IFile file = (IFile)proxy.requestResource();
                                                    URI location = file.getLocationURI();
                                                    if (location == null) return false;
                                                    if (exclusionPatterns != null || inclusionPatterns != null)
                                                        if (Util.isExcluded(file, inclusionPatterns, exclusionPatterns))
                                                            return false;
                                                    String relativePathString = Util
                                                            .relativePath(file.getFullPath(), project.getFullPath().segmentCount()/*remove project segment*/);
                                                    indexedFileNames.put(relativePathString,
                                                                         indexedFileNames.get(relativePathString) == null
                                                                         || indexLastModified <
                                                                            EFS.getStore(location).fetchInfo().getLastModified()
                                                                         ? (Object)file
                                                                         : (Object)OK);
                                                }
                                                return false;
                                            case IResource.FOLDER:
                                                if (exclusionPatterns != null || inclusionPatterns != null)
                                                    if (Util.isExcluded(proxy.requestResource(), inclusionPatterns, exclusionPatterns))
                                                        return false;
                                                if (hasOutputs && outputs.contains(proxy.requestFullPath()))
                                                    return false;
                                        }
                                        return true;
                                    }
                                },
                                IResource.NONE
                                           );
                    }
                }
            }

            SourceElementParser parser = this.manager.getSourceElementParser(javaProject, null/*requestor will be set by indexer*/);
            Object[] names = indexedFileNames.keyTable;
            Object[] values = indexedFileNames.valueTable;
            for (int i = 0, namesLength = names.length; i < namesLength; i++) {
                String name = (String)names[i];
                if (name != null) {
                    if (this.isCancelled) return false;

                    Object value = values[i];
                    if (value != OK) {
                        if (value == DELETED)
                            this.manager.remove(name, this.containerPath);
                        else
                            this.manager.addSource((IFile)value, this.containerPath, parser);
                    }
                }
            }

            // request to save index when all cus have been indexed... also sets state to SAVED_STATE
            this.manager.request(new SaveIndex(this.containerPath, this.manager));
        } catch (CoreException e) {
            if (JobManager.VERBOSE) {
                Util.verbose("-> failed to index " + this.project + " because of the following exception:",
                             System.err); //$NON-NLS-1$ //$NON-NLS-2$
                e.printStackTrace();
            }
            this.manager.removeIndex(this.containerPath);
            return false;
        } catch (IOException e) {
            if (JobManager.VERBOSE) {
                Util.verbose("-> failed to index " + this.project + " because of the following exception:",
                             System.err); //$NON-NLS-1$ //$NON-NLS-2$
                e.printStackTrace();
            }
            this.manager.removeIndex(this.containerPath);
            return false;
        } finally {
            if (monitor != null)
                monitor.exitRead(); // free read lock
        }
        return true;
    }

    public int hashCode() {
        return this.project.hashCode();
    }

    protected Integer updatedIndexState() {
        return IndexManager.REBUILDING_STATE;
    }

    public String toString() {
        return "indexing project " + this.project.getFullPath(); //$NON-NLS-1$
    }
}
